How to Compress Images in Outlook Signatures

Make sure the signature that contains the image you want to compress is highlighted under Select signature to edit.

Click the image to be optimized with the right mouse button.

Select Picture… from the context menu that has shown.

Make sure you are on the Format Picture window’s Picture tab.

Click Compress….

Make sure Web/Screen is selected under Change resolution.

Now make sure Compress pictures is checked as well.

Click OK.

How to Compress Images in Outlook: FAQ

How much compression can I expect?

Do to expect much compression from Outlook’s image optimization tool.

For a typical photo taken with a smartphone, you can see images compressed by around 75% through the reduction in resolution. For images that are already optimized for display on the web or email, expect much less or no compression.

Still, compressing images in Outlook can serve as a quick way to avoid the most egregious excesses of modern digital images in email.

(How to compress images in Outlook tested with Outlook 2016; updated March 2018; title image: StockUnlimited)

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